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mysql判断后执行查询语句吗_如何看mysql执行的sql语句

时间：2024-06-02 06:41:10

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1先通过status命令查看Mysql运行状态

mysql> status;

--------------

mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1

Connection id: 113752

Current database: information_schema

Current user: push_user@localhost

SSL: Not in use

Current pager: stdout

Using outfile: ''

Using delimiter: ;

Server version: 5.1.73 Source distribution

Protocol version: 10

Connection: Localhost via UNIX socket

Server characterset: latin1

Db characterset: utf8

Client characterset: latin1

Conn. characterset: latin1

UNIX socket: /tmp/mysql.sock

Uptime: 22 days 8 hours 31 min 23 sec

Threads: 38 Questions: 1037751897 Slow queries: 2356 Opens: 79836

Flush tables: 1 Open tables: 64 Queries per second avg: 537.282

--------------

在上面显示列表的最后32313133353236313431303231363533e58685e5aeb931333361313234一条，我们来查看Slow queries这一项的值，如果多次查看的值大于0的话,说明有些查询sql命令执行时间过长。

2)这时再通过show processlist命令来查看当前正在运行的SQL，从中找出运行慢的SQL语句，找到执行慢的语句后，再用explain命令查看这些语句的执行计划。

mysql> show processlist;

+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+

+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+

| 113289 | push_user | 14.118.132.20:47333 | DW | Sleep | 628 | | NULL |

| 113753 | push_user | 14.118.132.20:28688 | DW | Sleep | 396 | | NULL |

+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+

38 rows in set (0.00 sec)

或者通过如下命令查询:

mysql> use information_schema;

mysql> select * from PROCESSLIST where info is not null;

+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+

TIME | STATE | INFO |

+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+

0 | executing | select * from PROCESSLIST where info is not null |

+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+

1 row in set (0.00 sec)

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